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A space to ponder, discuss, speculate, disagree, and learn.

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Old

Finally Published Physics::Ballistics to CPAN!

Posted 07-09-2017 at 05:57 PM by ttk (Unpopular Positions: One Geek's Take)

Around 2007'ish I started collecting/writing formulae related to the physics of ballistics, but they were a disorganized mish-mash. In 2014 I decided to straighten them out, write unit tests and documentation, and publish them to the CPAN central code repository.

This weekend I finally got it submitted!

https://metacpan.org/pod/release/TTK.../Ballistics.pm

I feel like it should be a huge milestone, but it gives me...
ttk
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Posted in Uncategorized
Views 66 Comments 0 ttk is offline
Old

Another systemd zero-day security vuln

Posted 07-06-2017 at 11:26 AM by ttk (Unpopular Positions: One Geek's Take)

Systemd falls back to root privileges when an invalid user account is specified.

Shadow-tools allows the creation of invalid user accounts.

Face, meet palm.

https://github.com/systemd/systemd/issues/6237

The systemd devs aren't being gracious about it, either.
ttk
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Posted in Uncategorized
Views 305 Comments 2 ttk is offline
Old

Datashack Update - Shelves!

Posted 01-01-2015 at 10:06 PM by ttk (Unpopular Positions: One Geek's Take)

I finally got around to hanging a couple of shelves in the Datashack, and I don't think the crazy person who constructed the building used proper 2x4 studs. The shelf brackets had holes on either side, about an inch apart, and I had to toe-in the screws pretty hard to get both of them to bite into stud. They must have used 1x4's or 1x2's or some other wacky thing.

Anyway, two shelves are in, and the equipment on that side of the building is on them (though I need to figure out something...
ttk
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Posted in Uncategorized
Views 893 Comments 0 ttk is offline
Old

Memory overhead of Python and Perl associative arrays

Posted 05-06-2014 at 06:51 PM by ttk (Unpopular Positions: One Geek's Take)

I've been measuring the relative memory overhead of perl hashes and python dicts (essentially the same data type, both associative arrays).

These measures are necessarily approximate, since they resize differently as the tables fill, but the overhead comes to about 57 bytes plus 76 bytes per element for perl, and 264 bytes plus 123 bytes per element for python. Both of these are for numeric-to-numeric mappings.

About halfway through this exercise, it occurred to me...
ttk
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Posted in Uncategorized
Views 497 Comments 0 ttk is offline

  



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